What is ASN AS397027?

ASN AS397027 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS397027?

AS397027 is listed under Block Line Systems, LLC.

What do peers, upstreams, and downstreams mean in ASN data?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access the full ASN tables?

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AS397027 Block Line Systems, LLC

ASN Lookup Tool

Block Line Systems, LLC infinitecomllc.com

US 9 Routes

AS Data

AS397027

AS397027 – Block Line Systems, LLC

AS Number	397027
AS Name	BLOCK-LINE-DENVER
Organization	Block Line Systems, LLC(blsl)
Country	US
Website	infinitecomllc.com
Number of IPv4 Routes	9
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2018-08-31

ASN Intelligence API for production workflows

Use ASN data for AS397027 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
24.53.152.0/24	AS397027	Block Line Systems, LLC	Block Line Systems, LLC	256
24.53.152.0/22	AS397027	Block Line Systems, LLC	Block Line Systems, LLC	1024
24.53.158.0/24	AS397027	Block Line Systems, LLC	Block Line Systems, LLC	256
24.53.157.0/24	AS397027	Block Line Systems, LLC	Block Line Systems, LLC	256
24.53.156.0/22	AS397027	Block Line Systems, LLC	Block Line Systems, LLC	1024
24.53.156.0/24	AS397027	Block Line Systems, LLC	Block Line Systems, LLC	256
24.53.159.0/24	AS397027	Block Line Systems, LLC	Block Line Systems, LLC	256
24.53.154.0/24	AS397027	Block Line Systems, LLC	Block Line Systems, LLC	256
24.53.155.0/24	AS397027	Block Line Systems, LLC	Block Line Systems, LLC	256

Raw Whois Response

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


ASNumber:       397027
ASName:         BLOCK-LINE-DENVER
ASHandle:       AS397027
RegDate:        2018-08-31
Updated:        2018-08-31    
Ref:            https://rdap.arin.net/registry/autnum/397027


OrgName:        Block Line Systems, LLC
OrgId:          BLSL
Address:        1645 West Chester Pike
Address:        Suite 200
City:           West Chester
StateProv:      PA
PostalCode:     19382
Country:        US
RegDate:        2015-11-12
Updated:        2025-09-16
Ref:            https://rdap.arin.net/registry/entity/BLSL

ReferralServer:  rwhois://rwhois.infinitecom.net:4321

OrgTechHandle: MST395-ARIN
OrgTechName:   Totoro, Michael Steven
OrgTechPhone:  +1-302-354-4543 
OrgTechEmail:  mtotoro@trusttelesystem.com
OrgTechRef:    https://rdap.arin.net/registry/entity/MST395-ARIN

OrgTechHandle: INE20-ARIN
OrgTechName:   IP Network Engineering
OrgTechPhone:  +1-419-724-3884 
OrgTechEmail:  ss-noc@sharedsvcs.com
OrgTechRef:    https://rdap.arin.net/registry/entity/INE20-ARIN

OrgAbuseHandle: IAA18-ARIN
OrgAbuseName:   IP Address Administrator
OrgAbusePhone:  +1-610-918-1646 
OrgAbuseEmail:  IPAdmin@infinitecomllc.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/IAA18-ARIN

OrgTechHandle: OWOLA3-ARIN
OrgTechName:   Owolabi, Olu 
OrgTechPhone:  +1-484-250-0957 
OrgTechEmail:  oowolabi@trusttelesystem.com
OrgTechRef:    https://rdap.arin.net/registry/entity/OWOLA3-ARIN

OrgNOCHandle: INE20-ARIN
OrgNOCName:   IP Network Engineering
OrgNOCPhone:  +1-419-724-3884 
OrgNOCEmail:  ss-noc@sharedsvcs.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/INE20-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#

Parsed Whois Response

Peers

AS Number	Description	Country
AS6939	Hurricane Electric LLC	US
AS3257	GTT Communications Inc.	US
AS174	Cogent Communications, LLC	US

Upstreams

AS Number	Description	Country
AS6939	Hurricane Electric LLC	US
AS3257	GTT Communications Inc.	US
AS174	Cogent Communications, LLC	US